Multi-unit rotor blade system integrated wind turbine

ABSTRACT

The described wind turbine has a set of propeller type wind force collecting rotor turbines which is comprised of an up-wind auxiliary rotor blade turbine, being disposed on the front end of the combined bevel-planet gear assembly, and a down-wind main rotor blade turbine together with attached extender having twice the radius of the auxiliary rotor turbine. These rotor blades rotate in opposite directions with respect to one another, and the extender enables the main turbine to be activated by normal wind speed without aerodynamic wake turbulence effects created by the movement of the auxiliary rotor blade. The super-large scale, integrated, multi-unit rotor blade wind turbine has four sets of wind force collecting rotor blade turbines composed of an auxiliary up-wind rotor turbine and three down-wind rotor turbine units evenly spaced around a central pivotal rotor hub on extenders which arc the same length as the radius of the auxiliary turbine blade. The above described wind turbines are provided with a microprocessor pitch control system thereby achieving a highly efficient stall and storm control operation.

TECHNICAL FIELD

The present invention converts natural wind energy into electricalenergy by increasing the speed of input rpm in a highly efficientintegrated bevel-planet gear box, and through the multi-unit rotor bladesystem using a propeller-type wind mill generator.

BACKGROUND ART

Wind is one of the oldest forms of energy used by man. With enormousincreases in demand for environmentally friendly sources of energy, plusa growing fossil-fuel shortage, development of alternative energysources has been stimulated. In this same environment, wind conversionsystems are becoming more efficient and competitive, generating amountsof electrical energy large enough for commercial use. However, in orderto meet global clean energy needs, it will be necessary to adopt a newapproach to wind-generated electrical energy production.

There are two major challenges to a developer of a wind energyconversion system: overall energy conversion efficiency and fluctuationsin wind speed and direction. The lower potential power output of windenergy dictates that an advanced conversion system must be ofconsiderable size if substantial amounts of electrical power are to begenerated.

Taking the above matter into account, the present invention provides amore efficient and improved system which is based on the Prior Artsystem patented in Korea under No. 057585 and in the U.S. Pat. No.5,222,924.

After experimental field testing, it became apparent that thecounter-rotation of the main and auxiliary rotor blades of the Prior Artin the wind turbine system (FIG. 15) had need of improvement. Forexample, the main rotor blade of the Prior Art is disposed in the frontof the tower in an up-wind position, while the auxiliary rotor blade ismounted in a down-wind position functioning as a tail in order that thewind turbine may face into the wind as the direction varies. However,the up-wind position of the main rotor blade created radius limitationsdue to the narrow space between the tip of the blade and the tower. Whenthe wind blew, the rotor blade was bent toward the tower, finallytouching it, with longer blades bending more easily. Rotational tipspeed, then, was limited with respect to the constraints imposed on thelength of the blade's radius.

A second structural configuration deficiency was the bevel and planetgear box. In the Prior Art, the sections are separated into an upperbevel gear member and a lower planetary gear member.

The design required a complicated lubrication system as well asextraneous components which curbed operational and mechanicalefficiency.

DISCLOSURE OF INVENTION

The present invention is distinguished from the Prior Art in that it iscomprised of an improved wind turbine having one auxiliary up-wind rotorblade in a counter-rotational relationship to a main down-wind rotorblade attached to an extender. The up-wind auxiliary rotor blade ispositioned in front of the combined bevel and planet gear box, and thedown-wind main rotor blade is mounted in the rear, respectively.

The radius of auxiliary rotor blade is one-half the length of theextender and the main rotor blade radius combined. The two rotationalspeeds of the main and auxiliary blades have a coincidental tip speedratio (λ=V₁ /Vo, Vo:Wind speed m/s, Vi:tip speed of rotor blades m/s)which reaches an optimum tip speed ratio independent of wind speedvariance. One of the special features of the combined bevel-planet geardevice is that the two discrete horizontal input rotational forces ofthe auxiliary and main rotor turbines are converted into a single higherrotational force which is imparted to the perpendicularly positionedgenerator located immediately beneath the gear box.

Accordingly, the first objective of the present invention was to providean improved, highly rigid, compact, combined bevel-planet gear assemblywhich could convert two rotational forces into one to generatedelectrical energy throughout the period of operation of a wind turbinedisposed on the top of a tower, and to provide a generator systemarranged perpendicular to the gear box, whose two horizontal,counter-rotating, input shaft's yielded energies entered thebevel-planet gear box, where they were integrated, and then transmittedto the vertical rotor shaft of the generator.

A further objective of the present invention 10 was to avoid aerodynamicwake turbulence effects, such as weakened wind stream velocity, throughthe provision of an extender the same length as the auxiliary bladeradius, leading from the rotor hub to the main rotor blade anchor. Thewind passes through the auxiliary rotor, activating the main rotor bynormal wind velocity alone, without it being disturbed by the wake ofthe auxiliary rotor turbine.

Objective number three of the present invention was to provide.

Objective number four of the present invention was to take advantage ofthis hybrid wind turbine system to function at high rotational speeds aswell as at high torques similar to a combination of the Americanmulti-blade low speed, high torque wind turbine and the Danish highspeed low torque wind turbine.

Furthermore, several significant advantages were derived from the factthat no yaw control system was required since the system wasomnidirectional, i.e., the preferred embodiment of the physicalstructure of the two rotor turbine system achieved an automaticadjustment to accept the wind from any direction.

Also, the variable speed operation meant that this wind energy convertersystem adjusted automatically to changes in wind velocity for maximumefficiency. As a result, rotor speed, blade pitch and optimum tip speedratio were automatically aligned to obtain the peak performance.

A function of the electronic pitch control actuator was to act as astall regulator/storm control device which turns the rotor blades inorder to deactivate the generator in the event wind velocity exceeded alevel necessary for the safe operation of the system.

This represented an ideal solution for interrupting operations andinitiating an emergency stall when necessary, and it was superior to aconventional braking system because it avoided the stresses to thesystem created by forcible stalling using a mechanical friction brakesystem.

A principal objective of the present invention was to provide anadvanced super-large scale wind conversion system consisting of anintegrated, multi-unit rotor blade wind turbine system. It is generallyknown that the conventional large scale wind turbine system has severaltechnical weak points. The first is its rotor diameter limitations.According to general aerodynamic theory, the output power of a generatoris proportional to the square of the sweeping area of the blade.

However, the length of the radius of the rotor blade has also beenlimited by difficulties in manufacturing longer blades which areaerodynamically balanced.

To minimize these obstacles, the present invention integrates amulti-unit rotor blade system to create a super-large wind machine.

As shown in FIG. 10, it was achieved through the use of three extendersrevolving around a main rotor hub, each of which has a rotor blade unitpositioned at the apex. The individual rotors rotate clockwise, whilethe total assembly unit revolves counter clockwise, effectivelycanceling the outer motion speed created by the individual rotor bladeunits.

BRIEF DESCRIPTION OF DRAWINGS

The aspects, uses and advantages of the present invention will be morefully appreciated as the same becomes better understood through thefollowing detailed descriptions of the accompanying drawings:

FIG. 1(A) is the front elevational view of the present invention.

FIG. 1(B) is the side elevational view of the present invention.

FIG. 2 is a sectional view of the combined bevel-planet gear boxassembly of the present invention.

FIG. 3 is a sectional detail of the FIG. 2 illustration.

FIG. 4 is a detailed view of the section along the A--A line of thebevel-planet gear box assembly presented in FIG. 2.

FIG. 5 is a detailed view of the section along the C--C line of thebevel-planet gear assembly presented in FIG. 2.

FIG. 6 is a detailed view of the top of the section along the A--A linepresented in FIG. 2.

FIG. 7 is an enlargement of the section along the D--D line of FIG. 2.

FIG. 8 is an enlargement of detail E in FIG. 2.

FIG. 9 is a sectional view of another functional embodiment of thecombined bevel-planet gear assembly of the present invention.

FIG. 10 is the side elevation of a super-large, integrated, multi-unitrotor blade wind turbine of the present invention.

FIG. 11 is a front elevation of FIG. 10.

FIG. 12 is a sectional view of the physical structure of the rotor bladesystem introduced in FIG. 9.

FIG. 13 is a sectional view of physical structure of the main unitturbine illustrated in FIG. 12.

FIG. 14 is a detailed view of the section along the A--A line of themain unit presented in FIG. 12.

FIG. 15 is a side elevation of a conventional wind turbine, a.k.a. PriorArt.

BEST MODE FOR CARRYING OUT THE INVENTION

In reference to details regarding illustrations of the preferred designsof the present invention, i.e., the integrated, multi unit rotor bladesystem, as shown in FIG. 1(A), FIG. 1(B) and FIG. 2, it is comprised of

a main rotor blade (110) attached to the rotor turbine (100)

auxiliary rotor blades(210) attached to the rotor turbine (200)

the combined bevel-planet gear assembly (300)

a pitch control actuator (120) for the main rotor blade (110) on therotor turbine(100)

the differential gear members (130) of the main rotor blade (110)

a pitch control actuator (220) for the auxiliary rotor blades (201) onthe rotor turbine (200)

a vertical output shaft (420) leading from the combined bevel-planetgear assembly (300)

a vertical generator (410), which is mounted within the tower (400)directly beneath the gear box assembly (300)

As shown in FIG. 1 (B), the up-wind auxiliary rotor 20 blade (210) onthe rotor turbine (200) has a radius half length of the extender andmain rotor blade (110) combined, being disposed on the rear end of thegear assembly (300), and it operates in a counter-rotational manner tothe main rotor blade (11C) at an identical rotational tip speed. Thisconfiguration keeps the turbine facing into the prevailing wind at alltimes.

The auxiliary rotor turbine (200) is nearly half size of the main rotorturbine (100) and consists of a three-bladed rotor (210) attached by ashaft (211) to the rotor turbine (200), which rotates at nearly doublethe speed of the main rotor turbine (100). The main rotor turbine (100)consists of a three-bladed rotor blade (110) with an extender (111)continuing from the main rotor turbine hub assembly of the combinedbevel-planet gear assembly (300) to the anchor point of the main rotorblade (110).

The length of the extender (111) from the main rotor blade (110) isalmost equivalent to the length of the auxiliary rotor blade (210) ofauxiliary rotor turbine (200). This allows the main rotor turbine (100)to perform effectively in normal wind conditions without wake turbulenceeffects caused by the auxiliary rotor turbine (200).

As shown in FIG. 3, the combined gear assembly (300) includeshorizontally-positioned bevel gear (311).

This gear (311) is faced by its counter part, a lower bevel gear (312) .A plurality of three planet gears (323) are affixed to the inward faceof bevel gear (311). A ring gear (322) is rigidly attached to the inwardface of bevel gear (312).

The planet gear spider consists of planet gears (323) which are attachedto bevel gear (311) and a ring gear (322) which is attached to bevelgear (312) inclusively. At the same time, the upper bevel gear (311) andlower bevel gear (312) are perpendicularly disposed in a gearedrelationship to the vertically positioned bevel gears (313) and (314).

The bevel gear (313) is fixed to one end of the input rotary shaft (230)leading from the auxiliary rotor turbine (200). The bevel gear (314) isfixed to the input rotary shaft (150) of the main rotor turbine (100).Both of these are disposed in a geared relationship to the upper (311)and lower bevel gear (312).

Both bevel gear (311) and (312) respond to the main rotor turbine's(100) rotation and rotate in the opposite direction at an identicalspeed from bevel gear (313) and (314), which respond to the auxiliaryrotor turbine's (200) rotation, respectively.

Looking now at both FIG. 3 and FIG. 6, subsequent to the above describedmechanism, the sun gear (321), which is disposed at the center of theplanet gear spider, rotates in a geared relationship to the three planetgears (323), which rotate in a respective pivotal axis, revolving aroundthe sun gear (321); while the ring gear (322), which is in a gearedrelationship with the planet gears (323), rotates in the oppositedirection.

As described above, the rotational input force of the auxiliary rotorturbine (200) and the main rotor turbine (100) are combined in thecompact bevel-planet gear assembly (300) device, which is composed of aset of planetary member; three planet gears (323), a ring gear (322), asun gear (321), and a pair of vertical bevel gears (313) (314), a pairof horizontal bevel gears (311) (312), which are integrated in a "T"shaped gear box assembly.

Further, the two low speed input rotary shafts located in the horizontalposition are geared into one high speed output rotary shaft located inthe vertical position, all within one compact gear box.

In reference to detailed illustrations in FIG. 3 and FIG. 5, the inputrotor hub of the main rotor turbine (100), as diagrammed, is a preferredembodiment of the input differential gear member (130) (see FIG. 3)enhancing efficiency, in theory, by a doubling of rpm from the inputspeed of the main rotor turbine (100) so as to match the tip speed ofthe auxiliary rotor turbine (200). The input differential gear member(130) is comprised of a fixed, vertical bevel gear (131) attached toframe (140) (see FIG. 3) and an opposing vertical rotating bevel gear(133) which is coupled to the main rotor blade (100) (see FIG. 3) ofturbine (100).

The input rotary shaft (150) (see FIG. 3! extends from the inputvertical bevel gear (314) to the three revolving bevel gears (132) (seeFIG. 3 and FIG. 5). Associated bearings (112), located at one end ofeach extender (111) of the main rotor blade (110) of the main rotorturbine (100), revolve around the fixed bevel gear (131), in gearing!stationed bevel gear (131), engaging with bevel gear (133). Thedifferential gear system is attached to the input rotary shaft (150) inorder to permit a matching speed with rotary shaft (230) allowing theauxiliary rotor turbine (200) to turn at double the speed of the mainrotor turbine (100) both of whose energy input is then imparted to thecombined bevel-planet gear assembly (300) (see FIG. 3 and FIG. 4).

Consequently, the total rotational output number (20) of the verticaloutput rotary shaft (420) (FIG. 2 and FIG. 3) attached to combinedbevel-planet gear assembly (300) is Zo=(ZS+2ZR/ZS)X 2n, wherein "ZS"represents the number of teeth of sun gear (321), "ZR" represents thenumber of teeth of ring gear (322) and "n" represents the number ofinput rotations of main rotor turbine (100).

In FIG. 9, an alternative structural embodiment of the present inventionis depicted, where the main rotor turbine (100) and auxiliary rotorturbine (200), integrated with the combined bevel-planet gear assembly(300) are consistent with the equation Zo=(ZS+2ZR/ZS)X 2n through theaddition of upper horizontal bevel gear (311-1) and lower horizontalbevel gear (312-1) being disposed in the same pivotal axis as bevel gear(311) and (312), and which are in a geared relationship with bevel gear(314-1), which is twice the size of the originally described bevel gear(314). The input rotary shaft (150) connects bevel gear (314-1) to themain rotor blade turbine (100) . The resulting operational performancefunction of the various gears is exactly the same as that of the inputdifferential bevel gears (130) of the main rotor turbine (100) describedin FIG. 3.

Turning now to the side and front elevation views of the super-largescale multi-rotor blade turbine integrated wind conversion systemdepicted in FIG. 10 and FIG. 11, it is now in order to describe indetail the component parts and their relationship in both structure andfunction.

The composite wind turbine system of the present invention is intendedto provide a super large sweeping area formed by an upwind auxiliaryrotor turbine (200) attached to front end of combined bevel-planet gearassembly (300 along with three main down-wind multi-unit rotor turbine(500), each of which has a unit rotor blade (531) (see FIG. 13) mountedon a hollow support extender (511) and an input axle shaft (510) of themain multi-unit rotor turbine (500) to the input bevel gears (520) and(521), and through extender (511) to the coupled bevel gear (132,132')of the main rotor hub assembly positioned rear end of combinedbevel-planet gear assembly (300) referred to in FIG. 12, FIG. 13 andFIG. 14.

The rotational forces of the unit rotor blade (531) of main multi-unitrotor turbines (500) are imparted to the input vertical bevel gears(520), which are in a geared relationship with the horizontal bevelgears (521) (see FIG. 13). The forces are transferred through input axleshaft (510) to the bevel gears (132,132') (see FIG. 12 and FIG. 14),which are affixed to the end of input axle shaft (510,111) and which arerevolving around the fixed bevel gear (131). The main hub of rotorturbine assembly has the three main multi-unit rotor turbines (500)rotating around the bevel gear (131) which is then coupled to the inputrotary shaft (150)!. Similar functions of operational principles aredescribed here-to-fore in relation to FIG. 3 and FIG. 9.

As shown in FIG. 11, the rotational direction of unit rotor blade (531)of rotor turbine (500) is in a clockwise direction, while the main rotorhub assembly of the attached supporting extenders (511) leading to theunit rotor turbines (500) is revolving in a counter-clockwise direction.consequently, when the rotational speeds are identical and the properconfiguration of rotational input bevel gears (520), (521), fixed bevelgear (131) and orbital input bevel gears (132,132') exists, the outwardorbital tip speed of the unit rotor blade (531) of rotor turbine (500)is counter balanced by the opposing rotational speed of the supportingextender (511) of the main rotor hub assembly.

One of the important features of the present invention is the pitchcontrol feathering mechanism used in both normal and stormy windconditions.

The pitch control actuator (120) of the main rotor blade (110) of rotorturbine (100), the auxiliary rotor turbine (220) and the controlactuator (532) for rotor blade (531) of rotor turbine (500) arefeathered independently (see FIG. 3, FIG. 9, FIG. 12 and FIG. 13). Thismaintains an optimum tip speed ratio during variable wind speedoperation. It also initiates a stall mechanism for assuring the survivalin extremely strong wind conditions.

Referring to FIG. 3, FIG. 9, FIG. 12 and FIG. 13, the pitch controlactuators (120), (220) and (532) are composed of a actuator motor (124),which can rotate clockwise or conter-clockwise with actuating gearmembers (123) (see FIG. 7) and associated worm gear (122) and worm wheel(121) (see FIG. 8).

The main rotor turbine (100) and auxiliary rotor turbine (220) areindependently controlled by a microprocessor which monitors all winddata through a wind velocity meter and monitors the individual rpm's ofboth the auxiliary (220) and main turbines (100) so as to keep the sameoptimum tip speed ratio for all three unit rotor turbines (500).

Detail "E" for FIG. 2, as shown enlarged in FIG. 7 and FIG. 8,illustrated the component parts of the pitch control (120), (220) (seeFIG. 2) and (532) (see FIG. 13) and their relationship operationally andfunctionally.

The first is the start up function whereby the microprocessor adjuststhe obtuse angle of the blade, and the blade begins to turn in responseto rotatable wind speed being applied for a predetermined period oftime. The actuator motor (124) rotates the activating gear member (123)coincidentally with the worm gears (122) in synchronization with wormwheels (121) which are affixed to the extended axle shaft of rotorblades (111) and (211) (see FIG. 3) and axle shaft (530) of the unitrotor turbine depicted in FIG. 13. This adjusts the pitch angle of theblades of the rotor turbine.

The second function of the actuator motor (124) is to keep an optimumtip speed ratio in various wind speed conditions by continuouslyrotating in a clockwise or counter-clockwise direction depending on thecontrol signal received from the microprocessor.

The third function is a storm control regulated stall. As exceedinglystrong wind forces are applied over the rotor turbines, the stormcontrol mechanism is activated, changing the rotor blade pitch to keepthe turbine from turning.

The emergency stop control thereby operates manually rather than by theuse of a mechanical frictional braking system. These functions areperformed by preloaded software located in the microprocessor.

Numerous modifications and variations of the present invention arepossible, such as modifiable single blade rotors, multi-blade rotors,composite individual unit turbines or multi-unit turbines. Also, therotational direction of the auxiliary and main rotor turbines can bemade either counter-rotating or single directional be simply addinggearing devices to either the auxiliary or main rotor turbine.

All such modifications are intended to be included within the scope ofthis present invention as defined by the following claims.

What is claimed is:
 1. A rotor blade system integrated wind turbinecomprising, support means, a gear assembly supported by said supportmeans, an auxiliary turbine and a main turbine drivingly connected tosaid gear assembly, each of said turbines including a plurality ofturbine blades being mounted for rotation in substantially parallelplanes, the auxiliary turbine blades being mounted for rotation about anaxis, said main turbine blades being disposed downwind of said auxiliaryturbine blades, each of said blades having an innermost portion and atip, the tips of said auxiliary blades defining a first circle duringrotation thereof, the innermost portion of said main turbine bladesdefining a second circle during rotation thereof, the tips of said mainturbine blades defining a third circle during rotation thereof, thecircle defined by the main turbine blades which is nearest to said axisbeing spaced from said axis by a distance substantially equal to theradius of said first circle so that the main turbine blades are notdisturbed by the wake of said auxiliary turbine blades.
 2. A rotor bladesystem integrated wind turbine as defined in claim 1, wherein said mainturbine blades rotate in a direction opposite to the direction ofrotation of said auxiliary turbine blades.
 3. A rotor blade systemintegrated wind turbine as defined in claim 1, wherein said main andauxiliary turbine blades rotate in the same direction.
 4. A rotor bladesystem integrated wind turbine as defined in claim 1, wherein the rateof rotation of said auxiliary rotor blades is greater then the rate ofrotation of said main rotor blades so that the tip speed ratio of saidauxiliary rotor blades and said main rotor blades are substantially thesame.
 5. A rotor blade system integrated wind turbine as defined inclaim 1, further including means for adjusting the pitch of saidauxiliary turbine blades and said main turbine blades.
 6. A rotor bladesystem integrated wind turbine comprising, support means, a gearassembly supported by said support means, an auxiliary turbine and amain turbine drivingly connected to said gear assembly and being mountedfor rotation about a common axis, each of said turbines including aplurality of turbine blades extending substantially perpendicular tosaid axis and being mounted for rotation in substantially parallelplanes, the blades of said main turbine being disposed downwind of theblades of said auxiliary turbine, each of said blades having aninnermost portion and a tip, the tips of said auxiliary blades defininga first circle during rotation thereof, the innermost portions of saidmain turbine blades defining a second circle during rotation thereof,the radius of said second circle being substantially equal to the radiusof said first circle so that the main turbine blades are not disturbedby the wake of said auxiliary turbine blades.
 7. A rotor blade systemintegrated wind turbine as defined in claim 6, wherein said main turbineblades rotate in a direction opposite to the direction of rotation ofsaid auxiliary turbine blades.
 8. A rotor blade system integrated windturbine as defined in claim 6, wherein said main and auxiliary turbineblades rotate in the same direction.
 9. A rotor blade system integratedwind turbine as defined in claim 6, wherein the rate of rotation of saidauxiliary rotor blades is greater then the rate of rotation of said mainrotor blades so that the tip speed ratio of said auxiliary rotor bladesand said main rotor blades is substantially the same.
 10. A rotor bladesystem integrated wind turbine as defined in claim 6, wherein saidauxiliary turbine and said main turbine have outputs, said gear assemblyincluding means for mechanically combining said outputs to provide asingle system output.
 11. A rotor blade system integrated wind turbineas defined in claim 6, wherein the gear assembly comprises main andauxiliary input shafts being collinear with said axis, the main inputshaft being connected to the main turbine, and the auxiliary input shaftbeing connected to the auxiliary turbine, an output shaft positionedperpendicular to the input shafts, said input shafts being connected bybevel gears to planetary gearing including a sun gear connected to saidoutput shaft.
 12. A rotor blade system integrated wind turbine asdefined in claim 6, wherein the gear assembly comprises auxiliary andmain input shafts being collinear with said axis, a pair of horizontalbevel gears, a pair of vertical bevel gears meshed with said horizontalbevel gears, one of said vertical bevel gears being connected to theauxiliary input shaft and the other of said vertical bevel gears beingconnected to the main input shaft.
 13. A rotor blade system integratedwind turbine as defined in claim 6, wherein the gear assembly comprisesfirst upper and lower horizontal bevel gears and a first vertical bevelgear positioned about said axis and meshed with the first upper andlower horizontal bevel gears, and second upper and lower horizontalbevel gears and a second vertical bevel gear positioned about said axisand meshed with the second upper and lower horizontal bevel gears, thesecond upper horizontal bevel gear being attached to the first upperhorizontal bevel gear, said second lower bevel gear being attached tothe first lower horizontal bevel gear, said first vertical bevel gearbeing connected to the auxiliary turbine and said second vertical bevelgear being connected to the main turbine.
 14. A rotor blade systemintegrated wind turbine comprising, support means, a gear assemblysupported by said support means, an auxiliary turbine drivinglyconnected to said gear assembly and being mounted for rotation about afirst axis, a plurality of main turbines drivingly connected to saidgear assembly, said main turbines being mounted for rotation about aplurality of axes parallel to, equidistant from and symmetricallydistributed about said first axis, each of said turbines including aplurality of turbine blades extending substantially perpendicular to theaxis of the associated turbine and being mounted for rotation insubstantially parallel planes, the blades of said main turbine beingdisposed downwind of the blades of said auxiliary turbine, each of saidblades having an innermost portion and a tip, the tips of said auxiliaryblades defining a first circle during rotation thereof, the tips of theblades of each of the main turbines defining a circle to thereby definea plurality of circles during rotation thereof, each of said pluralityof circles defined by the tips of the blades of said main turbines beingspaced from said first axis a distance substantially equal to the radiusof said first circle so that the main turbine blades are not disturbedby the wake of said auxiliary turbine blades.
 15. A rotor blade systemintegrated wind turbine as defined in claim 14, wherein said mainturbine blades rotate in a direction opposite to the direction ofrotation of said auxiliary turbine blades.
 16. A rotor blade systemintegrated wind turbine as defined in claim 14, wherein said main andauxiliary turbine blades rotate in the same direction.
 17. A rotor bladesystem integrated wind turbine as defined in claim 14, wherein each ofsaid main turbines is supported by a supporting extender, the extendersbeing connected to a common main rotor hub assembly, all of said mainturbine blades rotating in one direction, and said main rotor hubassembly and said extenders rotating in the opposite direction so thatthe orbital tip speed of the main turbine is counter balanced by theopposed rotation of the main rotor hub assembly and the extenders.
 18. Arotor blade system integrated wind turbine as defined in claim 14,wherein said auxiliary turbine and said main turbines have outputs, saidgear assembly including means for mechanically combining said outputs toprovide a single system output.
 19. A rotor blade system integrated windturbine as defined in claim 14, wherein each of said main turbinesfurther comprises an input shaft positioned perpendicular to theplurality of axes, a horizontal shaft collinear with one of said axes, afirst bevel gear connected to the input shaft, and a second bevel gearmeshed with said first bevel gear and connected to said horizontal shaftfor rotation about one of said axes.
 20. A rotor blade system integratedwind turbine as defined in claim 19, wherein said gear assemblycomprises a main input shaft collinear with said first axis, each ofsaid main turbine input shafts having an inner end, said main turbineinput shaft being perpendicular to said first axis and rotatable, afirst bevel gear connected to each of said inner ends and beingrotatable with said main turbine input shafts, and a fixed bevel gearmeshed with each of said first bevel gears.